[Bognar]

You have no idea what you're talking about. Even mediocre FPS players use positional sound as a huge cue for how to react, which means the client is going to know the positions of every player and non-player entity in a medium range. That's a _huge_ advantage to any hacked client.

Even if the FPS had no sound, an aimbot-free hacked client that knows the positions of only the players that you can see would still provide a significant benefit because a high fidelity radar and pointers can be placed on the screen. No one can sneak up on you. And no you can't base it on which way the player is looking because you can turn around faster than network latency.

Can you limit the impact of hacked clients? Sure, people might not be able to do egregious stuff like X-ray your position from across the map. Locally, though, game clients need a large amount of information to provide a good experience.